304 lines
7.7 KiB
Go
304 lines
7.7 KiB
Go
package server
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import (
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"database/sql"
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"errors"
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"fmt"
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_ "github.com/mattn/go-sqlite3" // SQLite driver
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"log"
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"strings"
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"time"
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)
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// Messages cache
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const (
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createMessagesTableQuery = `
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BEGIN;
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CREATE TABLE IF NOT EXISTS messages (
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id TEXT PRIMARY KEY,
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time INT NOT NULL,
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topic TEXT NOT NULL,
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message TEXT NOT NULL,
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title TEXT NOT NULL,
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priority INT NOT NULL,
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tags TEXT NOT NULL,
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click TEXT NOT NULL,
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published INT NOT NULL
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);
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CREATE INDEX IF NOT EXISTS idx_topic ON messages (topic);
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COMMIT;
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`
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insertMessageQuery = `INSERT INTO messages (id, time, topic, message, title, priority, tags, click, published) VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?)`
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pruneMessagesQuery = `DELETE FROM messages WHERE time < ? AND published = 1`
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selectMessagesSinceTimeQuery = `
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SELECT id, time, topic, message, title, priority, tags, click
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FROM messages
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WHERE topic = ? AND time >= ? AND published = 1
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ORDER BY time ASC
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`
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selectMessagesSinceTimeIncludeScheduledQuery = `
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SELECT id, time, topic, message, title, priority, tags, click
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FROM messages
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WHERE topic = ? AND time >= ?
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ORDER BY time ASC
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`
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selectMessagesDueQuery = `
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SELECT id, time, topic, message, title, priority, tags, click
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FROM messages
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WHERE time <= ? AND published = 0
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`
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updateMessagePublishedQuery = `UPDATE messages SET published = 1 WHERE id = ?`
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selectMessagesCountQuery = `SELECT COUNT(*) FROM messages`
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selectMessageCountForTopicQuery = `SELECT COUNT(*) FROM messages WHERE topic = ?`
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selectTopicsQuery = `SELECT topic FROM messages GROUP BY topic`
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)
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// Schema management queries
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const (
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currentSchemaVersion = 3
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createSchemaVersionTableQuery = `
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CREATE TABLE IF NOT EXISTS schemaVersion (
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id INT PRIMARY KEY,
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version INT NOT NULL
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);
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`
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insertSchemaVersion = `INSERT INTO schemaVersion VALUES (1, ?)`
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updateSchemaVersion = `UPDATE schemaVersion SET version = ? WHERE id = 1`
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selectSchemaVersionQuery = `SELECT version FROM schemaVersion WHERE id = 1`
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// 0 -> 1
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migrate0To1AlterMessagesTableQuery = `
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BEGIN;
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ALTER TABLE messages ADD COLUMN title TEXT NOT NULL DEFAULT('');
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ALTER TABLE messages ADD COLUMN priority INT NOT NULL DEFAULT(0);
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ALTER TABLE messages ADD COLUMN tags TEXT NOT NULL DEFAULT('');
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COMMIT;
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`
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// 1 -> 2
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migrate1To2AlterMessagesTableQuery = `
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ALTER TABLE messages ADD COLUMN published INT NOT NULL DEFAULT(1);
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`
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// 2 -> 3
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migrate2To3AlterMessagesTableQuery = `
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ALTER TABLE messages ADD COLUMN click TEXT NOT NULL DEFAULT('');
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`
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)
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type sqliteCache struct {
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db *sql.DB
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}
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var _ cache = (*sqliteCache)(nil)
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func newSqliteCache(filename string) (*sqliteCache, error) {
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db, err := sql.Open("sqlite3", filename)
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if err != nil {
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return nil, err
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}
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if err := setupDB(db); err != nil {
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return nil, err
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}
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return &sqliteCache{
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db: db,
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}, nil
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}
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func (c *sqliteCache) AddMessage(m *message) error {
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if m.Event != messageEvent {
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return errUnexpectedMessageType
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}
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published := m.Time <= time.Now().Unix()
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_, err := c.db.Exec(insertMessageQuery, m.ID, m.Time, m.Topic, m.Message, m.Title, m.Priority, strings.Join(m.Tags, ","), m.Click, published)
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return err
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}
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func (c *sqliteCache) Messages(topic string, since sinceTime, scheduled bool) ([]*message, error) {
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if since.IsNone() {
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return make([]*message, 0), nil
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}
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var rows *sql.Rows
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var err error
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if scheduled {
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rows, err = c.db.Query(selectMessagesSinceTimeIncludeScheduledQuery, topic, since.Time().Unix())
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} else {
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rows, err = c.db.Query(selectMessagesSinceTimeQuery, topic, since.Time().Unix())
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}
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if err != nil {
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return nil, err
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}
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return readMessages(rows)
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}
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func (c *sqliteCache) MessagesDue() ([]*message, error) {
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rows, err := c.db.Query(selectMessagesDueQuery, time.Now().Unix())
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if err != nil {
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return nil, err
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}
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return readMessages(rows)
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}
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func (c *sqliteCache) MarkPublished(m *message) error {
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_, err := c.db.Exec(updateMessagePublishedQuery, m.ID)
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return err
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}
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func (c *sqliteCache) MessageCount(topic string) (int, error) {
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rows, err := c.db.Query(selectMessageCountForTopicQuery, topic)
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if err != nil {
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return 0, err
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}
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defer rows.Close()
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var count int
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if !rows.Next() {
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return 0, errors.New("no rows found")
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}
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if err := rows.Scan(&count); err != nil {
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return 0, err
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} else if err := rows.Err(); err != nil {
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return 0, err
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}
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return count, nil
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}
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func (c *sqliteCache) Topics() (map[string]*topic, error) {
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rows, err := c.db.Query(selectTopicsQuery)
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if err != nil {
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return nil, err
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}
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defer rows.Close()
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topics := make(map[string]*topic)
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for rows.Next() {
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var id string
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if err := rows.Scan(&id); err != nil {
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return nil, err
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}
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topics[id] = newTopic(id)
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}
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if err := rows.Err(); err != nil {
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return nil, err
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}
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return topics, nil
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}
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func (c *sqliteCache) Prune(olderThan time.Time) error {
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_, err := c.db.Exec(pruneMessagesQuery, olderThan.Unix())
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return err
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}
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func readMessages(rows *sql.Rows) ([]*message, error) {
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defer rows.Close()
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messages := make([]*message, 0)
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for rows.Next() {
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var timestamp int64
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var priority int
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var id, topic, msg, title, tagsStr, click string
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if err := rows.Scan(&id, ×tamp, &topic, &msg, &title, &priority, &tagsStr, &click); err != nil {
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return nil, err
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}
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var tags []string
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if tagsStr != "" {
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tags = strings.Split(tagsStr, ",")
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}
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messages = append(messages, &message{
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ID: id,
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Time: timestamp,
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Event: messageEvent,
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Topic: topic,
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Message: msg,
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Title: title,
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Priority: priority,
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Tags: tags,
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Click: click,
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})
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}
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if err := rows.Err(); err != nil {
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return nil, err
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}
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return messages, nil
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}
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func setupDB(db *sql.DB) error {
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// If 'messages' table does not exist, this must be a new database
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rowsMC, err := db.Query(selectMessagesCountQuery)
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if err != nil {
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return setupNewDB(db)
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}
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rowsMC.Close()
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// If 'messages' table exists, check 'schemaVersion' table
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schemaVersion := 0
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rowsSV, err := db.Query(selectSchemaVersionQuery)
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if err == nil {
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defer rowsSV.Close()
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if !rowsSV.Next() {
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return errors.New("cannot determine schema version: cache file may be corrupt")
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}
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if err := rowsSV.Scan(&schemaVersion); err != nil {
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return err
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}
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rowsSV.Close()
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}
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// Do migrations
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if schemaVersion == currentSchemaVersion {
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return nil
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} else if schemaVersion == 0 {
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return migrateFrom0(db)
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} else if schemaVersion == 1 {
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return migrateFrom1(db)
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} else if schemaVersion == 2 {
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return migrateFrom2(db)
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}
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return fmt.Errorf("unexpected schema version found: %d", schemaVersion)
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}
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func setupNewDB(db *sql.DB) error {
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if _, err := db.Exec(createMessagesTableQuery); err != nil {
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return err
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}
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if _, err := db.Exec(createSchemaVersionTableQuery); err != nil {
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return err
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}
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if _, err := db.Exec(insertSchemaVersion, currentSchemaVersion); err != nil {
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return err
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}
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return nil
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}
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func migrateFrom0(db *sql.DB) error {
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log.Print("Migrating cache database schema: from 0 to 1")
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if _, err := db.Exec(migrate0To1AlterMessagesTableQuery); err != nil {
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return err
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}
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if _, err := db.Exec(createSchemaVersionTableQuery); err != nil {
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return err
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}
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if _, err := db.Exec(insertSchemaVersion, 1); err != nil {
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return err
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}
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return migrateFrom1(db)
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}
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func migrateFrom1(db *sql.DB) error {
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log.Print("Migrating cache database schema: from 1 to 2")
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if _, err := db.Exec(migrate1To2AlterMessagesTableQuery); err != nil {
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return err
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}
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if _, err := db.Exec(updateSchemaVersion, 2); err != nil {
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return err
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}
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return migrateFrom2(db)
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}
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func migrateFrom2(db *sql.DB) error {
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log.Print("Migrating cache database schema: from 2 to 3")
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if _, err := db.Exec(migrate2To3AlterMessagesTableQuery); err != nil {
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return err
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}
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if _, err := db.Exec(updateSchemaVersion, 3); err != nil {
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return err
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}
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return nil // Update this when a new version is added
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}
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